Rubber Washers Types: M6, M8, M10, M12, etc. Their Uses
When it comes to washers, the "M" designation refers to the metric system, and it is typically used to represent the diameter of the bolt or screw that the washer fits. While M6, M8, M10, and M12 are some of the most commonly used sizes, several other M variants of washers are used in various applications depending on the size of the fastener.
Washer Size (M)
Inner Diameter (ID)
Common Applications
M4
4 mm
Small electrical parts, light mechanical applications, and automotive components.
M5
5 mm
Plumbing systems, light machinery, and electrical components.
M6
6 mm
Household repairs, small automotive parts, and light machinery.
M7
7 mm
Specialized applications where slightly larger washers are needed to provide more load distribution.
M8
8 mm
Automotive, machinery, and small industrial applications.
M9
9 mm
Not commonly used but might be needed for certain specific projects.
M10
10 mm
Industrial machinery, mechanical systems, and automotive repairs
M11
11 mm
Used for special heavy-duty applications where M10 washers do not suffice.
M12
12 mm
Heavy-duty machinery, construction projects, and large industrial systems.
M14
14 mm
Construction, large machinery, and heavy-duty systems requiring strong load distribution.
M16
16 mm
Larger industrial and construction projects with high pressure and heavy-duty applications.
M18
18 mm
Large industrial systems, heavy construction equipment, and high-load environments.
M20
20 mm
Used for high-strength, large mechanical systems, and heavy-duty machinery in industrial settings.
M22
22 mm
Specialized in large-scale industrial machinery, construction, and engineering applications.
M24
24 mm
Used for large machinery and high-pressure industrial applications
M27
27 mm
Heavy-duty systems, including large construction and engineering projects.
M30
30 mm
High-load industrial systems, large-scale machinery, and high-strength construction applications.
When selecting rubber washers for your project, there are several key quality parameters to consider based on technical standards.
Material Type: The material of the rubber washer should be chosen based on the environment it will be used in. Common materials include neoprene, EPDM, nitrile, and silicone, each offering different levels of resistance to temperature, chemicals, and UV exposure.
Hardness: Rubber washers are available in various hardness levels, typically measured on the Shore A scale. The hardness should be chosen based on the required flexibility and sealing strength, with typical ranges between 30 to 90 Shore A.
Thickness: The thickness of the washer is crucial for its load-bearing capacity and vibration absorption. It should be selected according to the bolt size and mechanical load requirements.
Compression Set: This refers to the washer's ability to retain its shape after being compressed. A lower compression set ensures that the washer maintains its sealing ability over time.
Tensile Strength and Elongation: These properties determine the rubber's resistance to stress and its ability to stretch without breaking. Higher tensile strength and elongation values ensure better durability and flexibility.
Temperature Resistance: The washer should be able to withstand the temperature range it will be exposed to, whether it’s high heat or extreme cold. Materials like EPDM are suitable for high-temperature environments, while nitrile is better for oil-based applications.
Chemical Resistance: Depending on the application, rubber washers may need to resist oils, water, acids, or other chemicals. For example, nitrile is ideal for fuel and oil resistance, while EPDM offers great resistance to water and weathering.
Dimensional Tolerance: Ensuring the rubber washer fits correctly with the fastener is crucial. The washer’s inner and outer diameters should match the bolt or screw size, meeting relevant standards like ISO 3302-1 for dimensional tolerances.
Surface Finish: A smooth surface finish is important to ensure a proper seal and avoid leakage or damage to the application.
By considering these parameters, you can select the ideal rubber washers that meet your project’s specific requirements. At Bharti Rubber Industries, we provide high-quality rubber washers designed to meet the technical standards for a range of industrial applications. Whether you need washers for high temperatures, chemical resistance, or vibration damping, we have the perfect solution to suit your needs.
Industry Standards for Rubber Washers
Quality of rubber washers is critical to ensuring the longevity and efficiency of mechanical, electrical, and industrial applications. By considering key selection parameters such as material, hardness, tensile strength, and chemical resistance, you can choose the right rubber washers that meet the demands of your project.
ISO 3302-1: Specifies dimensional tolerances for rubber products, ensuring uniformity and consistency.
DIN 125/ISO 7089: Standards for flat washers (including rubber washers) used in mechanical applications.
ASTM D412: Defines test methods for determining the properties of rubber, such as elongation and tensile strength.
ISO 37: Sets requirements for tensile strength and elongation testing for rubber materials.
ISO 1817: Provides testing procedures for the effects of aging, including the impact of heat, oil, and weather on rubber washers.
ASTM D2000: Establishes a classification system for rubber materials based on their properties (e.g., ozone resistance, tensile strength, etc.).
How to Choose the Right Size Washer for Your Project
When selecting the correct rubber washer size for your project, consider the following:
Bolt Size: The inner diameter of the rubber washer should match the diameter of the bolt or screw (M6, M8, M10, M12, etc.).
Application Type: The pressure and load requirements of your application will determine the thickness and outer diameter of the washer. Choose a washer with the right thickness to provide adequate load-bearing capacity and sealing.
Material: Rubber washers come in a variety of materials, including neoprene, EPDM, nitrile, and silicone. Consider environmental factors such as temperature, chemicals, and exposure to oils when selecting the material.
At Bharti Rubber Industries, we offer a wide range of rubber washers in various sizes and materials to meet the unique needs of your project. Whether you’re working on plumbing, automotive, or industrial systems, we have the perfect washer to ensure optimal performance and durability. Choose Bharti Rubber Industries for high-quality rubber washers that provide long-lasting results.
